Title:
PROCESS FOR PRODUCTION OF SEAMLESS PIPES
Document Type and Number:
WIPO Patent Application WO/2007/111131
Kind Code:
A1
Abstract:
A process for producing seamless pipes excellent in mechanical properties with a great energy-saving effect by conducting the steps from piercing-rolling to heat treatment continuously. Namely, a process for the production of seamless pipes which comprises piercing-rolling, elongation-rolling, sizing, reheating, quenching and tempering, characterized in that the sizing is finished under the conditions of seamless pipe temperature of 600°C or above and below 800°C and that the reheating is conducted by charging a seamless pipe at a temperature of 400°C or above into a reheating furnace and reheating the pipe at a temperature of Ac3 transformation point or above and up to 1000°C.
Inventors:
OOSAKO HAJIME (JP)
Application Number:
PCT/JP2007/055074
Publication Date:
October 04, 2007
Filing Date:
March 14, 2007
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
OOSAKO HAJIME (JP)
OOSAKO HAJIME (JP)
International Classes:
C21D8/10; B21B23/00
Domestic Patent References:
| WO1996012574B |
Foreign References:
| JPS59150019A | 1984-08-28 | |||
| JPH09287028A | 1997-11-04 | |||
| JPH0598350A | 1993-04-20 | |||
| JPH08311551A | 1996-11-26 | |||
| JP2001240913A | 2001-09-04 |
Other References:
See also references of EP 2006396A4
Attorney, Agent or Firm:
SUGIOKA, Kanji et al. (Amagasaki Building 5-17-23, Higashinaniwa-cho, Amagasaki-sh, Hyogo 92, JP)
Download PDF:
Previous Patent: RADAR APPARATUS AND MOBILE UNIT
Next Patent: INFORMATION REPRODUCING APPARATUS AND METHOD, AND COMPUTER PROGRAM
Next Patent: INFORMATION REPRODUCING APPARATUS AND METHOD, AND COMPUTER PROGRAM